Lifting-jack.



P. PETERSON.

LIFUNYG JACK. APPLICATION FALED JULY 19. 191s.

Peeee'eed Feb.11, 1919.

2 SHEETS-SHEET 2 i PAUL PETERSON, OF SUPERIOR, WISCONSIN.

LIFTING-J ACK.

Specication of Letters Patent.

Patented Feb. 11, 1919.

Application led July 19, 1918. Serial No. 245,671.

To all whom t may concern Be it known that I, PAUL PETERSON, a citizen of the United States residing at Superior, in the county of iDouglas and State of Wisconsin, have invented certain new and. useful Improvements in Lifting- Jacks, of which the following is a specification.

This invention relates to improvements in lifting jacks and its object is to provide a device of this class that is simple in construction, eiflcient in operation and cheap to manufacture. With the foregoing an other objects in view the invention consists in the combination and arrangement of parts to be hereinafter fully described, pointed out in the appended claims and illustrated in the accompanying drawings which form a part of this specification and in which- Figure 1 is a vertical sectional view through my improved jack.

Fig. 2 is a front view of the jack.

Fig. 3 is a cross section taken on line 3-3 of Fig. 1.

Fig. 11 is a view similar to Fig. 1 but with the movable parts in an altered posi'- tion.

Fig. 5 is a rear view of the jack.

Like reference characters denote corresponding parts throughout the several views.

My improved jack comprises the frame having the base 1, sides 2, front 3, with the perforation 4, and the rear wall 5 having the perforation or slot 6. The top of the frame is open to permit movement of the standard 7 provided with the table 8, said standard being formed with the elongated vertical slot 9 through which the guide bolts 10 extend, said bolts being carried by the sides 2 of the frame. The standard 7 is formed with a diminished portion 11 having the teeth 12, said diminished portion terminating in the foot 13 adapted to seat in a perforation 14 formed in the frame base 1. Upon the said foot 13 a movable rack 15 provided with teeth 16 is disposed, said rack extending the entire length of the diminished standard portion 11 and being connected by expansion springs 17 and by the links 17iL to said portion 11. The purpose of said links 17a being to positively limit the relative movement of rack 15 and to prevent such movement impairing the lifting power of the jack.

Upon a suitable fulcrum 18 secured in the extension or front 3 of the frame the hand lever 19 is arranged, saidhand lever terminating in the toothed segment 2O adapted for engagement with the teeth 16 of the rack 15 to raise, the same together with the standard 7 and its table 8, the teeth 12 of said standard being adapted for engagement with the pawl 21 fulcrumed upon 'pin 22 carried by the frame-ears 23 whereby said standard may be retained in adjusted position with relation to the frame base l. A spring 24 connecting the dog 21 and jack frame serves to yieldingly retain said dog in engagement with the teeth 12. To the front 3 of the frame I secure a pivotally supported stop 25 which, in its normal position, shown in full lines in Figs. 1 and 4 prevents disengagement of the segmental teeth 20 from the rack 16. When it is desired to disengage the segmental teeth 20 from the rack teeth 16 to permit the rack 15 and standard 7 to drop to normal position the stop 25 is moved into the position shown dotted in Fig. 4C when the handle of lever 19 may be depressed until the teeth 20 move entirely out of engagement with the rack teeth.

What is claimed is 1. In a lifting jack, a frame, a standard guided and supported in said frame, a table for said. standard, teeth formed along one edge of said standard, a dog carried by said frame for engagement with ysaid teeth, a rack carried by said standard whereby the same may be raised, said rack being movable relatively to said standard in one direction, a hand lever fulcrumed in said frame for operative engagement with said rack, and a pivotally supported stop carried by said frame for coperation with said hand lever.

2. In a lifting jack, a frame having a perforated base, a standard guided andsupported in said frame, said standard being formed with a diminished portion, a table for said standard, teeth formed along edge of said diminished portion, a dog carried by said frame for engagement with said teeth, a foot for said standard adapted to seat in the perforated portion of said frame base, a toothed rack disposed upon said In testimony that I claim the foregoing foot and spaced away from the diminished as my own I have hereto aiixed my signa- 10 portion of said standard, connection between ture in the presence of two subscribing wit-l said rack and standard, a hand level1 fulnesses.

5 orumed in said frame for operative engage- PAUL PETERSON.

ment with said rack, and a pivotally sup- Witnesses: ported stop carried by said frame for eo- J. B. FRENCH, operation with said hand lever. G. WEISS.

Copies of this. patent-may be. obtained forl five eents'each, byA addressing the Commissioner of Patents, Washington, D. C, 

